I plan on getting a Boyd's thumbhole stock for my stainless carbine, but am wondering about an 18" fluted Kidd bull barrel or a 20" one. I will use the rifle for plinking and casual small game hunting. Once in a while I will shoot targets, but not in competition. I will use high speed ammo, and sometimes CCI Stingers for hunting, which work flawlessly out of the rifle now. I'm hoping to tap into the knowledge base here and would like opinions on barrel length.